Look carefully at circuits A and B, then answer the questions - Junior Cycle Science - Question h - 2010
Question h
Look carefully at circuits A and B, then answer the questions.
(i) In which circuit does the red LED light up?
Which?
(ii) Give a reason for your answer to (i) a... show full transcript
Worked Solution & Example Answer:Look carefully at circuits A and B, then answer the questions - Junior Cycle Science - Question h - 2010
Step 1
In which circuit does the red LED light up?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The red LED lights up in Circuit B.
Step 2
Give a reason for your answer to (i) above.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
This is because in Circuit B, the anode of the red LED is connected to the positive side of the battery, allowing current to flow through the LED and light it up. In contrast, in Circuit A, the orientation is reversed, preventing the LED from lighting due to reverse bias.
Step 3
Why is the resistor ‘R’ needed in both circuits?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The resistor 'R' is needed in both circuits to control the current flowing through the LED. Without the resistor, the current could become too high, risking damage to the LED by burning it out.
Join the Junior Cycle students using SimpleStudy...
